1227968849 has 2 divisors, whose sum is σ = 1227968850. Its totient is φ = 1227968848.

The previous prime is 1227968783. The next prime is 1227968851. The reversal of 1227968849 is 9488697221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 898800400 + 329168449 = 29980^2 + 18143^2 .

It is an emirp because it is prime and its reverse (9488697221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227968849 is a prime.

It is a super-2 number, since 2×1227968849² = 3015814988228769602, which contains 22 as substring.

Together with 1227968851, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1227968794 and 1227968803.

It is not a weakly prime, because it can be changed into another prime (1227968449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613984424 + 613984425.

It is an arithmetic number, because the mean of its divisors is an integer number (613984425).

Almost surely, 2^1227968849 is an apocalyptic number.

It is an amenable number.

1227968849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227968849 is an equidigital number, since it uses as much as digits as its factorization.

1227968849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 56.

The square root of 1227968849 is about 35042.3864626826. The cubic root of 1227968849 is about 1070.8511726656.

The spelling of 1227968849 in words is "one billion, two hundred twenty-seven million, nine hundred sixty-eight thousand, eight hundred forty-nine".